Refurbishing blocks of flats to very low or nearly zero energy level–technical and financial results plus co-benefits

Rose, Jørgen; Thomsen, Kirsten Engelund; Mørck, Ove; Gutierrez, Miriam Sanchez Mayoral; Jensen, Søren Østergaard

doi:10.1016/j.enbuild.2018.11.051

Cited by 22 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…of roofs by means of 25 cm thick mineral wool blankets installed in the air chamber. According to the literature, efficient solutions for roofs have a U-value between 0.09 and 0.2 W/m 2 •K[36,37]. As can be observed in Appendix A, the U-value of our renovated roofs is 0.12 W/m 2 •K.• Secondary glazing.…”

mentioning

confidence: 86%

See 1 more Smart Citation

Energy Retrofit of Social Housing with Cultural Value in Spain: Analysis of Strategies Conserving the Original Image vs. Coordinating Its Modification

2020

View full text Add to dashboard Cite

Two renovation strategies were considered and compared in this paper for the energy renovation of social housing in condo buildings built in 1945–1969, situated in residential estates that have been declared urban areas of interest. One of the strategies, named here the image conservation approach, consists of renovating the building with very efficient solutions, except for the brick-facing walls, which will only have insulation in the existing cavities. The other strategy, the image coordination approach, consists of renovating the whole building with efficient solutions, including external insulation for existing brick-facing walls, and drawing up coordination plans for each of the residential estates in order to guarantee a coordinated new image of the residential estates. By means of three case studies in the city of Zaragoza and four scenarios of improvement, the two strategies are compared regarding the regulation compliance, the energy use, the emissions reduction, the thermal comfort, and the cost-effectiveness of the measures. The results show that the image coordination approach is the best strategy in regard to the studied aspects, achieving a 69%–79% reduction of CO2 emissions and a 75%–97% reduction of heating use, as well as being the only one capable of transforming these buildings into nearly zero energy buildings (nZEBs).

show abstract

mentioning

confidence: 86%

“…• External insulation of 16 cm thick for plastered walls. According to the literature, efficient solutions for façades have a U-value between 0.15 and 0.3 W/m 2 •K [[36][37][38]. As can be observed in Appendix A, the U-value of our renovated plastered façades is quite low, specifically 0.15 W/m 2 •K.…”

mentioning

confidence: 90%

Energy Retrofit of Social Housing with Cultural Value in Spain: Analysis of Strategies Conserving the Original Image vs. Coordinating Its Modification

2020

View full text Add to dashboard Cite

show abstract

“…Furthermore, the GHG emissions co-benefits associated with water, waste and transportation usage in LEED building were also investigated in California [ 55 ]. As for the existing building, co-benefits of the residents, housing association and society in general, GHG emissions and energy consumption can be achieved after implementing retrofit technological measures [ 56 , 57 , 58 ]. The co-benefits of residential buildings in terms of the energy savings, costs and other additional benefits of renovation scenarios were investigated to support decision making [ 59 , 60 ].…”

Section: Review Of Relevant Workmentioning

confidence: 99%

Co-Benefits Analysis of Buildings Based on Different Renewal Strategies: The Emergy-Lca Approach

Cui

Hong

Liu

et al. 2021

IJERPH

View full text Add to dashboard Cite

Many cities have encountered challenges associated with rapid urban development, population growth and aging, in which urban renewal has become a promising option. Different renewal strategies, such as redevelopment, refurbishment and conservation, not only contributes to quality improvement and energy consumption reduction of dilapidated urban area, but also to greenhouse gas (GHG) emissions mitigation. Such integrated benefits are often termed as co-benefits. However, choosing the most co-benefits strategy to adopt requires a holistic understanding of social-economic and environmental aspects, which has been less reported in the existing literature. Under such circumstance, this article aims to shed light on the co-benefits of different renewal strategies by adopting the Emergy-Life cycle assessment method. Then, the method is applied to one case study of the refurbishment of an educational building located in Chongqing, China. Resource allocation, CO2 emissions and emergy-based indicators are calculated to assess the co-benefits during a 60-year research period, to compare the impacts of the complete demolition followed by a new one (rebuilding strategy) and the refurbishing of the existing building (refurbishment strategy). The case study shows that the annual emergy in the O&M phase of rebuilding strategy and refurbishment strategy were lower than existing building. Rebuilding and refurbishment strategies released approximately 59.1% and 80.6%, respectively, of the total CO2 emissions that would be produced by the existing building. The results reveal that substantial environmental benefits can be obtained in both the refurbishment and rebuilding strategies. On the other hand, it can be concluded that the emergy yield ratio (EYR) for the rebuilding strategy is higher than refurbishment strategy, which demonstrate the better performance of refurbishment considering that less resources are required to generate greater benefits. In addition, the value of environmental loading ratio (ELR) and emergy sustainability index (ESI) also suggests that the refurbishment strategy performs better from the perspective of the environment. Thereby, the refurbishment strategy is more suitable than the rebuilding strategy. Findings from this study can be useful to urban planners and decision-makers in choosing the most suitable strategy to improve the quality of existing buildings.

show abstract

“…The refurbishment has been evaluated in the International Energy Agency Annex 56 framework [61]. Furthermore, the research has been reported in an extensive report [62], which has been used as a major source of building specifications for this study.…”

Section: Case Study: the Renovation Of An Apartment Buildingmentioning

confidence: 99%

Multi-Objective Optimization of Building Life Cycle Performance. A Housing Renovation Case Study in Northern Europe

Montana¹,

Kanafani

Wittchen

et al. 2020

Sustainability

View full text Add to dashboard Cite

While the operational energy use of buildings is often regulated in current energy saving policies, their embodied greenhouse gas emissions still have a considerable mitigation potential. The study aims at developing a multi-objective optimization method for design and renovation of buildings incorporating the operational and embodied energy demands, global warming potential, and costs as objective functions. The optimization method was tested on the renovation of an apartment building in Denmark, mainly focusing envelope improvements as roof and exterior wall insulation and windows. Cellulose insulation has been the predominant result, together with fiber cement or aluminum-based cladding and 2-layered glazing. The annual energy demand has been reduced from 166.4 to a range between 76.5 and 83.7 kWh/(m2 y) in the optimal solutions. The fact that the legal requirements of 70 kWh/(m2 y) are nearly met without building service improvements indicates that energy requirements can be fulfilled without compromising greenhouse gas emissions and cost. Since the method relies on standard national performance reporting tools, the authors believe that this study is a preliminary step towards more cost-efficient and low-carbon building renovations by utilizing multi-optimization techniques.

show abstract

Refurbishing blocks of flats to very low or nearly zero energy level–technical and financial results plus co-benefits

Cited by 22 publications

References 0 publications

Energy Retrofit of Social Housing with Cultural Value in Spain: Analysis of Strategies Conserving the Original Image vs. Coordinating Its Modification

Energy Retrofit of Social Housing with Cultural Value in Spain: Analysis of Strategies Conserving the Original Image vs. Coordinating Its Modification

Co-Benefits Analysis of Buildings Based on Different Renewal Strategies: The Emergy-Lca Approach

Multi-Objective Optimization of Building Life Cycle Performance. A Housing Renovation Case Study in Northern Europe

Contact Info

Product

Resources

About